Re: [libvirt] [PATCH 4/9] Add support for encrypted (qcow) volume creation.
On Tue, Jul 21, 2009 at 01:12:00PM +0200, Miloslav Trma?? wrote:
Supports only virStorageVolCreateXML, not
virStorageVolCreateXMLFrom.
Curiously, qemu-img does not need the passphrase for anything to create
an encrypted volume. This implementation is sufficient for the qcow2
format, and for other formats when all encryption parameters are
pre-specified.
I believe that qemu-img only requires the passphrase if it is going
to actually write data blocks to the file. Thus creating an empty
file doesn't need it, but in the code path which clones an existing
file it would need it. eg, virStorageVolCreateXMLFrom() would need
it if you had implemented that - indeed that would potentially need
both the source and destination keys.
Daniel
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